Patent SG-11201805336U-A (SG)
Title: Head unit control circuit
Inventor: FURUKAWA RYOTA
IPC: B41J2/045
Filed: 2016-12-22
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau „ (10) International Publication Number (43) International Publication Date ^ ^ WO 2017/111067 A1 29 June 2017 (29.06.2017) WIPO I PCT (51) International Patent Classification: B41J2/14 (2006.01) B41J2/045 (2006.01) B41J2/01 (2006.01) (21) International Application Number: PCT/JP2016/088463 (22) International Filing Date: 22 December 2016 (22.12.2016) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 2015-252877 25 December 2015 (25.12.2015) JP (71) Applicant: SEIKO EPSON CORPORATION [JP/JP]; 1- 6, Shinjuku 4-chome, Shinjuku-ku, Tokyo, 1608801 (JP). (72) Inventor: FURUKAWA, Ryota; c/o SEIKO EPSON CORPORATION, 3-5, Owa 3-chome, Suwa-shi, Nagano, 3928502 (JP). (74) Agents: FUSE, Yukio et al.; 8th Floor, Hirata Building, 8- 16, Sarugaku-cho 2-chome, Chiyoda-ku, Tokyo, 1010064 (JP). (81) Designated States (unless otherwise indicated, for every kind of national protection available)'. AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available)'. ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, [Continued on next page] (54) Title: HEAD UNIT CONTROL CIRCUIT t-40 TR ^—-—a- SigX _i (57) : A head unit control circuit controls a head unit, and is provided outside the head unit, the head unit in­ cluding: an ejecting section that includes a piezoelectric ele­ ment, and can eject a liquid corresponding to displacement of the piezoelectric element, the piezoelectric element being dis­ placed corresponding to a change in potential of a drive sig­ nal when the drive signal has been supplied to the piezoelec - trie element; a determination circuit that determines whether or not the piezoelectric element has a predetermined electric­ al storage capability; and an ejection limit circuit that stops the supply of the drive signal to the piezoelectric element and limits the ejection of the liquid from the ejection section when a result of the determination is negative, the head unit control circuit supplying an instruction signal, a first designa­ tion signal, and a second designation signal to the head unit, the instruction signal instructing the head unit to execute the determination, the determination circuit executing the de­ termination during a determination period in which the first designation signal is set to a high level, the second designa­ tion signal is set to a low level, and the instruction signal is supplied. wo 2017/111067 AI III llll IIII III III III 11II III lllll lllll 111 Hill 111 1 lllllll llll 111 llll LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art. 21(3))